Law firm CMS has published a new legal analysis titled "What is happening to Open RAN?", a question that itself signals how far confidence in the open radio agenda has cooled since its peak.

The piece comes from CMS.law, the international firm that tracks telecom regulatory and technology policy. Its framing matters for operators, vendors and policymakers. Two years ago, the same question would have read as celebratory. Today it reads as skeptical.

Why does the question itself matter?

Open RAN promised to break the grip of the incumbent radio vendors. The idea was simple. Standardized interfaces would let operators mix radio units, baseband software and management stacks from different suppliers. Competition would drive down unit costs. New entrants would gain a route into markets long closed to them.

The CMS analysis asks what has actually happened. That is the question every procurement and spectrum team in a mid-sized operator now faces. Boards approved Open RAN trials on the assumption of cost savings and supply-chain resilience. Those teams must now justify whether the assumption still holds.

For practitioners, the legal dimension is not incidental. Open RAN touches:

• procurement rules and vendor diversification mandates;
• security screening of new radio suppliers;
• standards-essential patent exposure across multi-vendor stacks;
• contractual liability when interfaces fail between vendors.

Each of these points changes risk allocation in network contracts. A lawyer-led review therefore reads differently from vendor marketing material.

What has tempered the optimism?

The CMS piece does not claim Open RAN has failed. It asks what is happening. That restrained framing reflects where the industry stands.

Early deployments demonstrated technical feasibility. Commercial scale proved harder. Operators found that integration work does not disappear. It shifts from the incumbent vendor to the operator or to a systems integrator. That cost was often underestimated in original business cases.

Political support also shifted. Governments in the United States, the United Kingdom, Japan and the European Union funded Open RAN pilots and pressed for supplier diversity, largely in response to restrictions on high-risk vendors. Policy enthusiasm continues, but it has not yet translated into a wholesale replacement cycle.

For network planners, the practical takeaway is this. Open RAN has moved from a movement to a line item. It competes for capex on the same terms as any other architecture choice, judged on total cost of ownership rather than ideology.

How should operators read a legal analysis now?

The value of the CMS piece lies in its discipline. Lawyers test claims against contractual and regulatory reality. That is the same discipline operators should apply internally.

A multi-vendor RAN is only as strong as its interface specifications and its support arrangements. When a fault crosses a vendor boundary, resolution depends on contract language written before deployment. Teams negotiating Open RAN deals now know this. Earlier deals often did not.

The analysis also arrives at a moment when investment committees are scrutinizing every network line item. Any argument for or against Open RAN must now carry its numbers with it. Claims without them no longer survive review.

What comes next?

The CMS publication is an invitation rather than a verdict. The open radio question remains open. Its answer will come from the next wave of procurement decisions, funding programs and standards milestones, where operators and their legal advisers will decide whether the movement's promises finally convert into contracts.